(Oxford University, informal) The Oxford Union (a debating society); not to be conflated with Oxford University Student Union (a students' union).
(US, with determiner, historical) Those of the United States that did not secede at the time of the Civil War (of the United States of America).
(with determiner, historical) The Soviet Union: the proper noun Union is the standard English translation of the proper noun Союз (Sojuz), and all-Union is the standard English translation of всесоюзный (vsesojuznyj).
A proper noun "union" represents various places in different countries, including canada, the philippines, and the united states.
The 0-10-2 locomotive wheel arrangement.
The canton of the United States flag: the portion of the flag containing stars on a blue background.
(countable) The act of uniting or joining two or more things into one.
(countable) The state of being united or joined; a state of unity or harmony.
(countable) That which is united, or made one; something formed by a combination or coalition of parts or members; a confederation; a consolidated body; a league.
(countable) A trade union; a workers' union.
(countable) An association of students at a university for social and/or political purposes; also in some cases a debating body.
(countable) A joint or other connection uniting parts of machinery, such as pipes.
(countable, set theory) The set containing all of the elements of two or more sets.
(countable) The act or state of marriage.
(countable, programming) A data structure that can store any of various types of item, but only one at a time.
(historical) An affiliation of several parishes for joint support and management of their poor; also the jointly-owned workhouse.
(set theory) To combine sets using the union operation.
Belonging to, represented by, or otherwise pertaining to a labour union.